Years ago I bought a tube of the famous (and seriously over priced Phil Wood bicycle grease). You can't imagine how disappointed I was when it melted and flowed out of the wheel bearings the first time I had the bike out after servicing the wheel bearings. I had not even ridden the bike since serving the wheel bearings. The bike was carried in the roof top Thule rack of my Taurus station wagon. When I went to get the bike off the roof, I noticed the roof and the wheels had Phil Wood grease spilling off the bearings onto the wheels and from there onto the roof of the car.

When I got home, I pulled the cones and found the ball bearings were completely dry. The Phil Wood had melted out 100%

Then I took samples of the Phil Wood, and some other types of grease from my garage and dropped dollops onto a large piece of cardboard and set it outside in the sun for over a month, observing the condition of the grease every few days.

Only one grease sat there without separating or changing shape or discoloring after the approximate five to six weeks that I ran the experiment. The outside temperature ran between 107F and 55F as it was the middle of the summer. The only grease that survived unaffected was the Valvoline Synthetic. The Valvoline looked the same the last day of the test as it did the first day. The Phil Wood was completely gone having melted and soaked into the cardboard. StaLube Lithium based white grease changed color to dark yellow and suffered some change of shape (chemical breakdown) and some absorbed into the cardboard. StaLube moly based did better, changing shape, but not color, and suffering less separation and less absorbed into the cardboard.

Since that test, I threw the entire tube of the Phil Wood into the trash, and I've used the Vavloline Synthetic for almost everything. I still have the tub of StaLube Lithium base, in fact I used it up and bought another tub of it for use primarily on hinges. The StaLube Heavy Duty disc brake wheel bearing grease (moly based) was used up. I had in install on the rear wheel bearings of the Taurus wagon, and with over 233K miles on the original wheel bearings (I changed the rear wheel bearings on the old wagon at 233K because I felt guilty about having forgotten to repack the wheel bearings for 100K miles), the wheel bearings were actually still good with the races showing virtually no wear, and I'd say that grease was pretty good stuff.